Add stubs for PEP 578

Author: msimacek

graalpython/lib-graalpython/_io.py

@@ -1,5 +1,5 @@
 # coding=utf-8
-# Copyright (c) 2017, 2018, Oracle and/or its affiliates.
+# Copyright (c) 2017, 2020, Oracle and/or its affiliates.
 # Copyright (c) 2017, The PyPy Project
 #
 #     The MIT License
@@ -545,6 +545,11 @@ def truncate(self, size=-1):
 sys.__stderr__ = sys.stderr
 
 
+# PEP 578 stub
+def open_code(path):
+    return FileIO(path, 'rb')
+
+
 # ----------------------------------------------------------------------------------------------------------------------
 #
 # following definitions: patched in the __builtins_patches__ module

graalpython/lib-graalpython/sys.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # The Universal Permissive License (UPL), Version 1.0
@@ -139,6 +139,15 @@ def make_hash_info_class():
 # continue prompt for interactive shell
 ps2 = "... "
 
+pycache_prefix = None
+
+# Stub audit hooks implementation for PEP 578
+def audit(str, *args):
+    pass
+
+def addaudithook(hook):
+    pass
+
 
 @__builtin__
 def exit(arg=0):